The idea behind landings being a key factor to determining your grade is so you practice and learn how to properly approach and land. Just doing as many “landings” as you can in a short period of time defeats the purpose if you are not concerned about actually learning how to properly approach and land.
The suggestions given above are great if you want to rack up XP and your landing counts if you are already proficient at it. However, since you are grade 1 - I’d suggest you do the right thing - learn how to properly fly patterns and practice doing proper touch and goes.